[UX] Minor improvement for dstack server (#3308)

Author: peterschmidt85

src/dstack/_internal/cli/commands/server.py

@@ -32,7 +32,14 @@ def _register(self):
             help="Bind socket to this port. Defaults to 3000.",
             default=os.getenv("DSTACK_SERVER_PORT", 3000),
         )
-        self._parser.add_argument(
+        group = self._parser.add_mutually_exclusive_group()
+        group.add_argument(
+            "-d",
+            "--debug",
+            help="Enable debug logging level (same as [code]-l debug[/code])",
+            action="store_true",
+        )
+        group.add_argument(
             "-l",
             "--log-level",
             type=str,
@@ -64,7 +71,7 @@ def _command(self, args: argparse.Namespace):
 
         os.environ["DSTACK_SERVER_HOST"] = args.host
         os.environ["DSTACK_SERVER_PORT"] = str(args.port)
-        os.environ["DSTACK_SERVER_LOG_LEVEL"] = args.log_level
+        os.environ["DSTACK_SERVER_LOG_LEVEL"] = "DEBUG" if args.debug else args.log_level
         if args.yes:
             os.environ["DSTACK_UPDATE_DEFAULT_PROJECT"] = "1"
         if args.no:

src/dstack/_internal/server/app.py

@@ -161,7 +161,12 @@ async def lifespan(app: FastAPI):
         logger.info("Background processing is disabled")
     PROBES_SCHEDULER.start()
     dstack_version = DSTACK_VERSION if DSTACK_VERSION else "(no version)"
-    logger.info(
+    job_network_mode_log = (
+        logger.info
+        if settings.JOB_NETWORK_MODE != settings.DEFAULT_JOB_NETWORK_MODE
+        else logger.debug
+    )
+    job_network_mode_log(
         "Job network mode: %s (%d)",
         settings.JOB_NETWORK_MODE.name,
         settings.JOB_NETWORK_MODE.value,

src/dstack/_internal/server/services/plugins.py

@@ -74,7 +74,7 @@ def load_plugins(enabled_plugins: list[str]):
 
     for name, import_path in _BUILTIN_PLUGINS.items():
         if name not in enabled_plugins:
-            logger.info(
+            logger.debug(
                 ("Found not enabled builtin plugin %s. Plugin will not be loaded."),
                 name,
             )

src/dstack/_internal/server/settings.py

@@ -153,9 +153,12 @@ class JobNetworkMode(Enum):
     FORCED_BRIDGE = 3
 
 
+DEFAULT_JOB_NETWORK_MODE = JobNetworkMode.HOST_WHEN_POSSIBLE
+
+
 def _get_job_network_mode() -> JobNetworkMode:
     # Current default
-    mode = JobNetworkMode.HOST_WHEN_POSSIBLE
+    mode = DEFAULT_JOB_NETWORK_MODE
     bridge_var = "DSTACK_FORCE_BRIDGE_NETWORK"
     force_bridge = environ.get_bool(bridge_var)
     mode_var = "DSTACK_SERVER_JOB_NETWORK_MODE"